Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the Newton-Rider International Giveaway for a Foldable Bicycle Helmet


Can a 8 speed derailleur be used for 7 speed?
#1
I plan on buy: http://www.disraeligears.co.uk/Site/Shimano_Deore_XT_derailleur_(M739_SGS).html

but I only have 7 gears so I'm wondering if the limit screws can be adjusted so it won't throw the chain off on the missing gear.
  Reply
#2
It should be OK, there's only 1.5 mm difference in the overall width of 7 and 8 speed cassettes according to Sheldon: http://www.sheldonbrown.com/k7.html
  Reply
#3
This will work with no problems.
The majority of Shimano rear derailleurs are compatible no matter the number of sprockets.
The only consideration is with the width of the chain and you will have no trouble with this XT working a seven speed.
Ride hard or ride home alone!
  Reply
#4
(07-28-2010, 10:11 PM)Bert1220 Wrote:  I plan on buy: http://www.disraeligears.co.uk/Site/Shimano_Deore_XT_derailleur_(M739_SGS).html

but I only have 7 gears so I'm wondering if the limit screws can be adjusted so it won't throw the chain off on the missing gear.

As other mentioned, no problem with the derailleur. The shifters are another matter, because the sprocket to sprocket spacing is different. If you are using friction shifters, no problem, if you are using clicking (ratcheting) shifters, they need to be Shimano compatible 7 speed shifters.
Nigel
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Big Basso, Tiny Colnago
Yesterday 08:11 PM
Can someone identify this Bottom Bracket...
01-20-2021 02:24 PM
11-42 cogs on Road bike?
01-20-2021 02:04 AM
NewBikeShopper (intro & opinion request)
01-20-2021 01:57 AM
1983 Trek 720
01-20-2021 12:23 AM
brakes
01-19-2021 11:25 PM
Road bike brakes upgrades
01-19-2021 01:41 PM
Do you wave to other cyclists?
01-18-2021 02:48 PM
Newton-Rider, a helmet like no other
01-15-2021 05:01 PM
Colnago R41 Handlebar
01-14-2021 10:24 PM

[-]
Top 5 Posters This Month
no avatar 1. Criminal
19 posts
no avatar 2. RollOn
6 posts
no avatar 3. Yevhen
5 posts
no avatar 4. NewBikeShopper
4 posts
no avatar 5. Bliip
3 posts